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| Mesoscale Discussion 923 |
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Mesoscale Discussion 0923
NWS Storm Prediction Center Norman OK
1027 PM CDT Tue Jun 16 2020
Areas affected...Central North Dakota...Northwest and Northcentral
South Dakota
Concerning...Severe potential...Watch unlikely
Valid 170327Z - 170600Z
Probability of Watch Issuance...20 percent
SUMMARY...A threat for wind damage and isolated large hail will be
possible late this evening from northwest and north-central South
Dakota northward across central North Dakota. The threat is expected
to remain isolated. For this reason, weather watch issuance appears
unlikely.
DISCUSSION...At the surface, a cold front continues to move eastward
across the western Dakotas. Surface dewpoints ahead of the front
generally range from the upper 50s F in central South Dakota to the
lower to mid 60s F in south-central North Dakota. Moderate
instability is still present along the moist corridor. Thunderstorms
have been expanding in coverage along the western edge of moderate
instability from near Rapid City northward to southwest of Bismarck.
63 kt and 65 kt wind gusts were reported out of the storm just to
the north-northeast of Faith, South Dakota. This convection will
continue to move north-northeastward over the next few hours and
will encounter greater buoyancy but stronger capping. This buoyancy
combined with moderate deep-layer shear, evident on regional WSR-88D
VWPs, will support an isolated wind damage threat for another hour
or two. The more intense cores may also produce hail. But as the
capping inversion increases, the threat should become marginal.
..Broyles/Grams.. 06/17/2020
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...FGF...ABR...BIS...UNR...
LAT...LON 47610194 46670223 46020249 45050284 44600273 44270224
44190165 44360063 45020022 47109942 47879942 48339983
48300158 47610194
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